View changer for stereoscopes



Nov. 19, 1929. E. P. cREssLER VIEW CHANGER FOR sTEREoscdPEs 2 Sheets-Sheet Filed Oct. 19. 1927 EdWd/Z/ F. (hem/w;

Nov. 19, 1929. E. P. CRESSLER v 1,736,071

VIEW CHANGER FOR STEREOSCOPES Filed 001;. 19, 192'? 2 Sheets-Sheet 2 awn/n51 Edward P -C/zzf$/e);

- ww-Mm 5 are mounted By my invention When a plurality of a changing the views,

Patented Nov. 19, 1929 EDWARD P. CRESSLER, or unwrro v, ansas 7 V r VIEW CHANGER Fonsrnanoscorns Application filed October 19, 1927. Serial No. 227,272;

This invention relates to view-changers for stereoscopes and contemplates the provision of an attachment for stereoscopes to facilitate changing views when a plurality of pictures on a single mat or mount.

In modern dentistry it is often necessary to take a plurality of X-ray pictures of a patients mouth and teeth, two views being taken of each part for use with a stereoscope. such pictures are made, it is now the custom to mount them in pairs on separate mounts or cards, which often results in the several mounts relating to one patient becoming separted and lost. Also, to observe the various pictures in turn,

it is necesary to remove one mount from the stereoscope and substitute another therefor.

these difliculties are overcome by first providing a mount on which all of the pictures relating to one caseimay be mounted and providing means which may be attached to a stereoscope and by which means the pictures on the mount are successively brought into alignment with the lenses of the stereoscope.

It is therefore an object of this invention to provide an attachment for stereoscopes including a pair of friction rollers between which a picture-mount may be inserted, the rollers being rotatable so that the picturemount may be raised or lowered at will.

Another object of the invention is to provide airame for atta hment to a stereoscope and which frame is provided with means for means for illuminating the pictures, and a light-difiusing screen between the illuminating means and the'pics tures. a

It is also an object of the invention to provide a mount on which a plurality of pairs of X-ray films may bemounted for use with a stereoscope. 7

Other objects and advantages will in part be obvious and in part more fully brought out as the description proceeds.

In the accompanying drawings I have illustrated an embodiment of my invention, but it is to be understood that the drawings are illustrative, merely, and are in no way .i'to be considered'as limiting the invention to in Fi g. 2, is. inserted the details of; construction therein shown, The invention is susceptible of embodiment ina variety of, other forms withou-tdeparting from the spirit and scope of the invention as defined: in, the appended claims.

Inthese drawings: Figure 1 is aplan view of a stereoscope and a view-changer attachment of my invention- I Fig.2 is a section taken substantially on line 22 of Figure 1;

Fig. 3 is a section on. line 3-3 of Figure 1;

Fig. 4c. is a front; view oi a picture-mount ofmy-inventiong i I Fig. 5 isa sectionjon line 5-5jof Fig. 4; and, I,

Fig- 6 is a section ou line-5 6 oiFig. 4,

Referring now to the drawings, the reference numeral 1 indicates a stereoscope of y provided with the :usual handle 2. Attached to the stereoscope is a frame consisting of side bars 3, 3 zainrd cross pieces 4:, 4c. Slidably mountedxon each of the side bars'is a sleeve or collar 5, these sleeves heing'connected by a cross piece 6 so that they'may, be moved in. unison. The. sleeves 5, 5 are provided with bearings 7:, 7jfor a pairofjtriction rollers 8, 8 which may be constructed of metal rods covered with. rubber or similar, material. These rollers are so and yet because of yielding covering they will permit of the passage of a picture-mount between them' One of'the rollers 8 isprovided with aknob19-by which it may be rowell known] construction and which is locatedas to be in contact tate'd; .Itwill now be clear that when a 1 indicated by. dotted lines, between the rollers 8 it 1 picture-mount 10,,

will be held .frictionally therein and that when the rollers are rotated, the picturemount may be raisedror lowered as desired. Also mounted on the. sleeves 5, .5 and in back. of" the rollers, are spring clips 11, 11 adapted, to supportta light-diffusing glass screen 12 of any well known construction. On the cross piece 4:, in are mountedsockets 18, 13iortl1ereceptiou of ba-clpof the light screen electricxhulbs 14-, 14 The arrangement is best; shown in Fig. 2 from an inspection of which-.-it wil-l be clear that light; passes irem Vol of the registering apertures.

the electric bulbs 14 through the screen 12, means to rotate said thence through the X-ray films on the picturemount and thence to the eye of the observer. in alignment with the A film mount of my invention is illustrated in Figs. 1, 5 and 6, the mount comprising a backing and-a facing 16, secured together, in parts, by adhesive andprovided with reduced portions or tongues 17 to facilitate the insertion of the mount-between the friction rollers 8 as hereinbefore described. The backing is provided with apertures 18 and the facing with apertures 19, the latter being I smaller than the former and superposed therevertically to position the rollers to move said mount 7 pictures successively Y lenses of the stereoscope,

and means toad ust said rollers horizontally to bringthe pictures into focus.

ln'testimony whereof I afiix my signature.

EDWARD P.-

on, thus providing a frame around the inside Along one edge of the apertures in thefacing, a tab 20 is cut out, which tab is bent out of the plane of the facing tofacilitate the insertion of an X-ray 21 between the'backing and facing, after secured to the film which it is bent back and by adhesive previous-1y applied to the tab.

It willn'owbe clear that I have provided a rdevice wh chis exceedingly simple in construct-ion and operation and which possesses many advantages as will be apparent to those skilled in this art. I'cla1m:

1. 'A' view-changer for stereoscopes including a frame, sleeves slidably mounted in said frame, bearings on said sleeves, a pa1r of friction rollers Journaled I in said bearings, and means to rotate saidrollers.

2. A view-changer for stereoscopes including a frame havingside bars, sleeves slidably mounted on said side bars, hearings on said ably mounted on said bars, bearings on said sleeves, a pair of friction rollers journaled in -said bearings and adapted to receive a picture-mount therebetween, illuminating means on said frame, and a light-difi'using screen supported on said sleeves between the illuminating means and the picture-mount. 5. A viewchanger for stereoscopes including a frame, friction rollers rotatably mounted on said frame and adapted to receive therebetween a picture-mount, means to rotate said rollers to move the pictures on said'mount successively into alignment with the lenses of the stereoscope, and means to adjust said rollers to bring the pictures intofocus.

. 6. In a stereoscop'e,aview-changer 1ncludi ing a frame, friction rollers rotatably'mounted on said frame and adapted to receive a mount provided with a vertical series of pictures,

oREssLER. 

